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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
11

Integrated Solar Cooking : Materials and Manufacturing of Conical Solar Cookers / Integrerad solmatlagning : Material och tillverkning av koniska solkokare

San, Kristy, Lindström, Ida January 2023 (has links)
This bachelor thesis is written as a Minor Field Studies (MFS) project and funded by SIDA, Sweden’s International Development Cooperation Agency. The project was made in cooperation with Engineers Without Borders Sweden and the local organization Asulma Centre in Nairobi. As a part of their Integrated Solar Research collaboration between the two organizations, the project strives to contribute to the United Nations sustainable development goals. Most households in Kenya rely on wood, charcoal and other sources of fossil fuel to use for cooking food. Unfortunately, these fuels produce smoke that causes great problems for the environment and for human health and can, in the worst cases, be lethal. It is estimated that 23 000 Kenyans die yearly from household air pollution produced from the fossil fueled stoves. Using the sun to cook food is a cheap alternative to conventional methods that are also more sustainable as it does not produce any smoke. The aim of this research was to study, analyze and optimize the model of a solar cooker called a conical cooker. In order to improve a previously developed concept of the conical cooker, this project focuses on what material and manufacturing methods should be used. A functional means tree was used to generate concepts, which were then analyzed using tools such as EduPack and an evaluation matrix based on a developed specification of requirements. After analyzing all the plausible options, it was suggested that the conical body should be made from a 1 mm (gauge 19) stainless steel sheet that has been mechanically polished and then joined together by crimping to shape the cone. The resulting product would cost 1430 KSH to manufacture, which is just below the cost of today’s cooker. It is also produced to withstand corrosion damage as well as maintain a reflective surface in order to work as a sufficient solar cooking method. This would be a cheap alternative that reduces health risks among the citizens of Kenya. However, as a solar cooker, it must be used together with other solutions as the sun is not always available which is why the project is called the Integradet Solar Cooking project. / Denna kandidatuppsats är skriven som ett Minor Field Studies (MFS)-projekt och finansierades av SIDA, Sveriges biståndsmyndighet. Projektet genomfördes i samarbete Ingenjörer Utan Gränser Sverige och den lokala organisationen Asulma Centre i Nairobi. Som en del av ett samarbete mellan de två organisationerna strävar detta projekt efter att bidra till Förenta Nationernas hållbara utvecklingsmål. De flesta hushåll i Kenya förlitar sig på ved, kol och andra fossila bränslekällor för att laga mat. Tyvärr producerar dessa bränslen rök som orsakar stora problem för miljön och människors hälsa och kan i värsta fall vara dödliga. Uppskattningsvis dör 23 000 kenyaner årligen till följd av luftföroreningar i hemmet som produceras av spisar med fossila bränslen. Att använda solen för att laga mat är ett billigt alternativ till konventionella metoder som dessutom är mer hållbart eftersom det inte producerar någon rök. Syftet med denna forskning var att studera, analysera och optimera modellen för en solkokare som kallas en konisk kokare. För att förbättra ett tidigare utvecklat koncept av den koniska kokaren fokuserade detta projekt på vilket material och vilka tillverkningsmetoder som bör användas. Ett funktionsmedelträd användes för att generera koncept som sedan analyserades med hjälp av bland annat EduPack och en utvärderingsmatris som baserats på en framtagen kravspecifikation. Efter att ha analyserat alla möjliga alternativ föreslogs att den koniska kroppen bör tillverkas genom att skära ut önskad form ur en 1 mm rostfri stålplåt (gauge 19). Plåten i rostfritt stål ska sedan mekaniskt poleras och sedan sammanfogas med falsning för att forma konen. Den resulterande produkten skulle kosta 1430 KSH (112 SEK) att tillverka, vilket är strax under priset för dagens kokare. Den är också konstruerad för att motstå korrosionsskador och behålla en reflekterande yta för att fungera som en effektiv solkokningsmetod. Detta skulle vara ett billigt alternativ som minskar hälsoriskerna bland lokalbefolkningen i Kenya. En solkokare måste dock användas tillsammans med andra lösningar eftersom solen inte alltid är tillgänglig varför projektet kallas för det Integrerade solmatlagningsprojektet.
12

Solar Energy and its Potential in Rural Botswana : a solution-driven qualitative field study with supplementary secondary research

Törngren, Patryk, Khodaverdian, Mariam January 2022 (has links)
Solar energy is of huge interest due to the current situation with global warming. A number of solar technologies have been developed, such as photovoltaic, concentrated solar power, and solar water heating systems, to name a few. However, the technologies are being slowly implemented, and Botswana, with generous amounts of sun, is particularly suitable for solar energy. The opportunities were investigated due to the overwhelming and horrifying warnings echoed by many of the world's scientists regarding global warming. First, a handful of solar technologies were thoroughly investigated. A field study at Gakgatla village was then conducted, where the locals were interviewed. The interviews were analyzed, and solutions were suggested based on the identified needs of the locals. The biggest challenges identified were the lack of electricity in many of the households, parental figures not being supportive of the children's education, and theft. Additionally, many locals cooked with firewood. The most helpful solution but difficult to implement is photovoltaic panels. Solar water heating systems would also be helpful to the locals who predominantly had cold water. Additionally, solar cookers could help minimize exposure to hazardous smoke. Lastly, solar lamps could help students study during nighttime. Some locals also showed huge enthusiasm for what the future partnership with Botho University will bring. It is encouraged to develop a prototype of a solar cooker, particularly the parabolic solar cooker, in order to install solar cookers in Gakgatla village. Solar dryers would also greatly benefit the locals and are also suggested developments. Both of the mentioned solutions would help minimize the locals' exposure to the hazards of cooking with firewood. The solar dryers will also help eliminate bacteria by drying the food in a protected space inside a container.
13

Utformning av kokenhet på solkokare : Designprojekt för den östafrikanska marknaden / Design of the cooking unit on a solar cooker : Design project for the East African market

Nilsson, Hampus January 2017 (has links)
Detta projekt är ett samarbete mellan Hampus Nilsson och Joto Solutions, projektet är ett examensarbete för Högskoleingenjörsexamen i innovationsteknik och design, MSGC12 vid fakulteten för hälsa, natur- och teknikvetenskap på Karlstads universitet. Studenten ska tillsammans med Joto Solutions utveckla kokenheten på deras solkokare. Projektet motsvarar 22.5 hp och utförs under vårterminen 2017. Handledare i projektet är Lennart Wihk, universitetsadjunkt, och examinator är Leo De Vin, professor. Joto Solutions AB startades våren 2015 i samband med två examensarbeten som initierades av Adam Fjaestad i Arvika. Under 2016/2017 avser Joto Solutions att göra en satsning på att utveckla och produktifiera solkokaren som sedan ska testas i fält. Målet med projektet att utveckla en design på solkokarens kokenhet som är väl anpassad för slutanvändaren. Frågeställningen som behandlas i rapporten är ”Hur ska solkokarens kokenhet utformas för att tillfredsställa slutanvändarens behov”. Projektet följer ett ingenjörs- och industridesignmässigt arbetssätt och grundar sig i produktutvecklingsprocessen. De faser som behandlas i detta projekt är projektplanering, förstudie, produktspecifikation, konceptgenerering, konceptval och layoutkonstruktion. Projektet resulterade i tre stycken kokenheter med varierande design som redovisas i layoutkonstruktionsfasen. Det finns utrymme för framtida vidareutveckling av de tre variationerna av kokenheten i form av konstruktionsförbättringar och säkerhetstillhörigheter. / This project is a collaboration between a student and the company Joto Solutions and is a degree work for a degree of bachelor in the field of innovation and design, MSGC12 at Karlstad University, Faculty of Health, Science and Technology. The student, together with Joto Solutions, will develop the cooking unit on their solar cooker. The project is equivalent to 22.5 ECTS credits and is being executed in the spring of 2017. Supervisor of the project is Lennart Wihk, a university lecturer, and the examiner is Leo De Vin, the professor. Joto Solutions AB was founded in the spring of 2015 in connection with two degree projects initiated by Adam Fjaestad in Arvika. In 2016/2017, Joto Solutions intends to make an effort to develop their solar cooker which will then be tested in the field. The aim of the project is to develop a design on the solar cooker's cooking unit that is well adapted to the end user needs. The question discussed in the report is "How should the solar cooker's cooking unit be designed to satisfy the end user's needs in a cultural and functional perspective." The project follows an engineering and industrial design practice and is based on the product development process. The phases covered in this project are project planning, preliminary study, product specification, concept generation, concept selection, layout design and risk analysis. The project resulted in three cooking units with varying designs that are presented in the layout design phase. There is room for further development of the three variations of cooking units in the form of design improvements and safety issues.

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